<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
                </el-col>
            </el-row>

            <!-- 表格 -->
            <tree-table :data="cateList" :columns="columns" :selection-type="false" :expand-type="false" show-index
                index-text="序号" border stripe :show-row-hover="false" class="tree_tb">
                <!-- 是否有效模板 -->
                <template slot="isok" slot-scope="scope">
                    <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color:lightgreen"></i>
                    <i class="el-icon-error" v-else></i>
                </template>
                <!-- 排序 -->
                <template slot="order" slot-scope="scope">
                    <el-tag size='mini' v-if="scope.row.cat_level ===0">一级</el-tag>
                    <el-tag type='success' size='mini' v-else-if="scope.row.cat_level ===1">二级</el-tag>
                    <el-tag type='warning' size='mini' v-else>三级</el-tag>
                </template>
                <!-- 操作 -->
                <template slot="opt" slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size='small'>编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size='small'>删除</el-button>
                </template>
            </tree-table>

            <el-row></el-row>

            <!-- 分页 -->
            <el-pagination :page-size="queryInfo.pagesize" :page-sizes="[3,5,10,15,20]"
                :current-page="queryInfo.pagenum" layout="total, sizes, prev, pager, next, jumper" :total="total"
                @size-change="handleSizeChange" @current-change="handleCurrentChange">
            </el-pagination>
        </el-card>
        <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%">
            <el-form :model="addCateForm" :rules="addCateRules" ref="addCateFormRef" label-width="100px"
                class="demo-ruleForm" @close="addDialogClosed">
                <el-form-item label="分类名称" prop="cat_name">
                    <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>
                <el-form-item label="父级分类">
                    <el-cascader v-model="seletedKeys" :options="parentCateList" :props="cascaderProps"
                        @change="parentCateChange" clearable>
                    </el-cascader>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addCate">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                queryInfo: {
                    type: 3,
                    pagenum: 1,
                    pagesize: 5
                },
                cateList: [],
                total: 0,
                columns: [
                    {
                        label: '分类名称',
                        prop: 'cat_name'
                    },
                    {
                        label: '是否有效',
                        type: 'template',
                        template: 'isok'
                    },
                    {
                        label: '排序',
                        type: 'template',
                        template: 'order'
                    },
                    {
                        label: '操作',
                        type: 'template',
                        template: 'opt'
                    }
                ],
                addCateDialogVisible: false,
                addCateForm: {
                    cat_name: '',
                    cat_pid: 0,
                    cat_level: 0
                },
                addCateRules: {
                    cat_name: [
                        { required: true, message: '请输入分类名称', trigger: 'blur' },
                        { min: 3, max: 5, message: '长度在 2 到 15 个字符', trigger: 'blur' }
                    ]
                },

                //级联数据源
                parentCateList: [],
                //级联展示的数据
                cascaderProps: {
                    expandTrigger: 'hover',
                    checkStrictly: true,
                    value: 'cat_id',
                    label: 'cat_name',
                    children: 'children'
                },
                //选中的父级分类id数组
                seletedKeys: []



            }
        },
        created() {
            this.getCateList()
        },
        methods: {
            async getCateList() {
                var { data: res } = await this.$http.get('categories', { params: this.queryInfo })
                if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
                this.cateList = res.data.result
                this.total = res.data.total
            },
            handleSizeChange(newSize) {
                this.queryInfo.pagesize = newSize
                this.getCateList()
            },
            handleCurrentChange(newPage) {
                this.queryInfo.pagenum = newPage
                this.getCateList()
            },
            showAddCateDialog() {
                this.getParentCateList()
                this.addCateDialogVisible = true
            },

            async getParentCateList() {
                var { data: res } = await this.$http.get('categories', { params: { type: 2 } })
                if (res.meta.status !== 200) return this.$message.error('获取父级分类失败')
                this.parentCateList = res.data
            },
            parentCateChange() {
                console.log(this.seletedKeys);
                if (this.seletedKeys.length > 0) {
                    this.addCateForm.cat_pid = this.seletedKeys[this.seletedKeys.length - 1]
                    this.addCateForm.cat_level = this.seletedKeys.length
                } else {
                    this.addCateForm.cat_pid = 0
                    this.addCateForm.cat_level = 0
                }
            },
            addCate() {
                this.$refs.addCateFormRef.validate(async valid => {
                    if (!valid) return
                    const { data: res } = await this.$http.post('categories', this.addCateForm)
                    if (res.meta.status !== 201) return this.$message.error('添加分类失败')
                    this.$message.success('添加分类成功')
                    this.getCateList()
                    this.addCateDialogVisible = false
                })

            },
            addDialogClosed() {
                this.$refs.addCateFormRef.resetFields()
                this.seletedKeys = []
                this.addCateForm = {}
            }
        }
    }
</script>


<style lang="less" scoped>
    .tree_tb {
        margin-top: 15px;
    }

    .el-cascader {
        width: 100%;
    }
</style>